Every server on your licence, on one page: what each volume holds, what is free, what has grown, what could be reclaimed, and whether a disk reports trouble — read by the Reclaim service on each server and sent here once a day. Nothing is installed on this side; the code that licensed the servers opens the page.
Reclaim Server — 1 year, per server — $99.90 $49.95 per server, per year. Every update included; the number of servers is the quantity you buy, and one code covers them all.
The same installer as the desktop, with the window left out where there is none to show it on (Server Core, or a box nobody signs in to):
msiexec /i Reclaim-Setup.msi /qn HEADLESS=1 "C:\Program Files\Reclaim\service\reclaim.exe" licence RCLM-XXXX-XXXX-XXXX "C:\Program Files\Reclaim\service\reclaim.exe" config email=you@example.com alerts=on report=week
The service indexes the volumes and keeps them current from the NTFS journal, and the updater sends the first document within the hour. On a server with a desktop, the ordinary install and the window's Settings do the same. Everything the service does is read-only, by construction — it holds no handle that can write.